965590721 has 4 divisors (see below), whose sum is σ = 965660244. Its totient is φ = 965521200.

The previous prime is 965590687. The next prime is 965590723. The reversal of 965590721 is 127095569.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 127095569 = 887 ⋅143287.

It can be written as a sum of positive squares in 2 ways, for example, as 643890625 + 321700096 = 25375^2 + 17936^2 .

It is a cyclic number.

It is not a de Polignac number, because 965590721 - 2⁶ = 965590657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (965590723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5990 + ... + 44351.

It is an arithmetic number, because the mean of its divisors is an integer number (241415061).

Almost surely, 2^965590721 is an apocalyptic number.

It is an amenable number.

965590721 is a deficient number, since it is larger than the sum of its proper divisors (69523).

965590721 is a wasteful number, since it uses less digits than its factorization.

965590721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69522.

The product of its (nonzero) digits is 170100, while the sum is 44.

The square root of 965590721 is about 31073.9556703037. The cubic root of 965590721 is about 988.3961109136.

The spelling of 965590721 in words is "nine hundred sixty-five million, five hundred ninety thousand, seven hundred twenty-one".